Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1992-08-31
1994-08-16
Noland, Thomas
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
73 84, G01B 500
Patent
active
053376137
ABSTRACT:
A measuring instrument includes first and second rigid, elongate measuring elements which are interconnected by a flexible element. The measuring elements are supported in a measuring tube inserted in the foundation soil. Whenever a displacement occurs in the foundation soil or construction, the measuring tube is deformed and the second measuring element is pivoted with respect to the first measuring element. The curvature or bending which thereby occurs in the flexible element of suitable dimensioning or configuration is preferably determined by at least one wire strain gage fitted to the flexible element in the plane of deformation, the elongations being converted, for example by use of a Wheatstone bridge circuit, into proportional electrical current or voltage signals. Preferably, wire strain gages are disposed on all four mutually perpendicular outer sides of the flexible element, in order to allow for the detection of displacements in mutually perpendicular planes.
REFERENCES:
Deflectometer, 1 page, "Indicating of Lateral Displacements. Relative Measurements in any Included Boreholes".
Rock Mechanics, Supp. 8, pp. 349-367, 1979, S. Hata, et al., "Field Measurements and Consideration on Deformability of Izumi Layers".
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